Head-to-head
Claude Fable 5.1 vs Claude Opus 5
As of October 25, 2026, Claude Fable 5.1 leads Claude Opus 5 on the Analyzer Index, 93.7 to 92.4.
Normalized scores are min-maxed per benchmark across all models we track (0–100). Open the interactive compare view to add benchmarks to the radar chart or pull in more models.
Claude Fable 5.1
AnthropicClaude Opus 5
Anthropic| At a glance | Claude Fable 5.1 | Claude Opus 5 |
|---|---|---|
| Analyzer Index | 93.7 (6/13) | 92.4 (5/13) |
| Blended price | $20.00/M | $10.00/M |
| Cheapest host | maker's API | maker's API |
| Context | 1.0M | 1.0M |
| Output speed | — | 88 tok/s |
| Time to first token | — | 3.71 s |
| Benchmark | Claude Fable 5.1 | Claude Opus 5 |
|---|---|---|
Chatbot Arena Elo Arena | ||
Output Speed Speed | — | |
Time to First Token TTFT | — | |
SimpleQA Verified SimpleQA | ||
OTIS Mock AIME 2024-2025 OTIS AIME | ||
Humanity's Last Exam HLE | — | |
ARC-AGI 2 ARC-AGI 2 | ||
Frontier Composite Frontier | ||
Output Stability Stability | ||
Format Adherence Format | ||
Recovery Rate Recovery | ||
API Success Rate API OK | — | |
Safety Handling Safety |
Methodology matches the main AI Model Analyzer About page.